Soft snow can hard work to
travel across, this isn't very deep, but will still have an
effect.
Not as bad as the absolute
worst surface ever - breakable crust. The surface appears
hard, but when you put your weight on your forward leg the
surface breaks and drops you the few inches to the harder
surface underneath. The result is that you have to "walk
upstairs" to walk on the level - all that extra energy just
goes into uselessly breaking the snow surface.
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